魔兽Lua 文字染色渐变

war3-color-fade-utf8.lua

------------------------------------------------------------------------
-- 本代码使用MIT协议 @ Lazy Knight (@LazyKnightX) 2025
------------------------------------------------------------------------

-- 
-- file: run.bat
--
-- @echo off
-- echo run lua - %1
-- tools\w3x2lni\bin\w3x2lni-lua.exe %1
-- 

-- 
-- 版本: 0.1.0
-- 联系: lazyknight#foxmail.com (#替换为@)
-- 
-- 记录:
-- 0.1.0 - 草稿实现。
--

local io = require 'io'

function lerp(a, b, t)
    return a + (b - a) * t
end

function math.round(r)
    return math.floor(r + 0.5)
end

function int(v)
    return math.round(v)
end

function rgba255(r, g, b, a)
    -- |cAARRGGBB

    r = int(r)
    g = int(g)
    b = int(b)
    a = int(a)
    return (a << 24) + (r << 16) + (g << 8) + b
end

function rgba255s(r, g, b, a)
    r = int(r)
    g = int(g)
    b = int(b)
    a = int(a)
    local R = string.format('%02X', r)
    local G = string.format('%02X', g)
    local B = string.format('%02X', b)
    local A = string.format('%02X', a)
    return string.format('|c%s%s%s%s', A, R, G, B)
end

function s2rgba255(s)
    s = string.gsub(s, '|c', '')
    local A = string.sub(s, 1, 2)
    local R = string.sub(s, 3, 4)
    local G = string.sub(s, 5, 6)
    local B = string.sub(s, 7, 8)
    local a = tonumber(A, 16)
    local r = tonumber(R, 16)
    local g = tonumber(G, 16)
    local b = tonumber(B, 16)
    return r, g, b, a
end

function scolorfade(s1, s2, t)
    local r1, g1, b1, a1 = s2rgba255(s1)
    local r2, g2, b2, a2 = s2rgba255(s2)
    local r = lerp(r1, r2, t)
    local g = lerp(g1, g2, t)
    local b = lerp(b1, b2, t)
    local a = lerp(a1, a2, t)
    return rgba255s(r, g, b, a)
end


local _log = ''
function log(...)
    local args = {...}
    local s = table.concat(args, '\t')
    _log = _log .. s .. '\n'
end

function logout()
    local f = io.open('temp\\log.txt', 'w')
    f:write(_log)
    f:close()
end

function stextfade(s, s1, s2)
    local n = utf8.len(s)

    log('==============')
    log(string.sub(s, 1, 3))
    local a = {}
    for i = 1, n do
        local t = (i - 1) / (n - 1)
        local x = scolorfade(s1, s2, t)
        local shift = utf8.offset(s, i)
        log(string.format('i: %s, shift: %s', i, shift))
        local c = string.sub(s, shift, shift + 2)
        log(c)
        table.insert(a, string.format('%s%s|r', x, c))
    end

    return table.concat(a, ''), n
end

function test()
    print(lerp(1, 5, 0.5))
    print(lerp(0xff, 0x00, 0.5))
    print(rgba255(0x00, 0x00, 0xff, 0x00), rgba255(0x00, 0x00, 0xff, 0x00) == (0xff - 0))
    print(rgba255(0x00, 0xff, 0xff, 0x00), rgba255(0x00, 0xff, 0xff, 0x00) == (0xffff - 0))
    print(rgba255(0xff, 0xff, 0xff, 0x00), rgba255(0xff, 0xff, 0xff, 0x00) == (0xffffff - 0))
    print(rgba255(0xff, 0xff, 0xff, 0xff), rgba255(0xff, 0xff, 0xff, 0xff) == (0xffffffff - 0))
    print(rgba255s(255, 255, 0, 98))
    print(s2rgba255('|cF0E0D0C0|r'))
    print(stextfade('钛合', '|cffff0000|r', '|cff00ff00|r'))
    print(stextfade('钛合金超闪绝杀技', '|cffff0000|r', '|cff00ff00|r'))
    log(stextfade('钛合金超闪绝杀技', '|cffff0000|r', '|cff00ff00|r'))
end

test()
logout()